Consider the relation schema R(T, E, C, D, Y) and the following set of F of...

Question

Question

Consider the relation schema R(T, E, C, D, Y) and the following set of F of functional dependencies:

The relation R decomposes into R₁(C, Y, E), R₂(C, T, D).

1. Is this decomposition lossless-join? _________________Blank 1

2. Is this decomposition dependency preserving? ? _____________Blank 2

engineering Computer-Science

Answer 1

Answer #1

Q1

This is false as we don't have the candidate key in both tables

Q2

False as we have lost DY -> T dependency as they are not D, Y, and T are not present together in any table.

Do give a thumbs up and in case there are doubts leave a comment.

Answer 2

Similar Homework Help Questions

Consider the following relation R= {A, B, C, D, E} and the following set of functional...

Consider the following relation R= {A, B, C, D, E} and the following set of functional dependencies F={ A → BC CD → E B + D E + A} Give a lossless, dependency-preserving decomposition into 3NF of schema R
Consider the following relation R = {A,B,C,D,E} and the following set of functional dependencies F =...

Consider the following relation R = {A,B,C,D,E} and the following set of functional dependencies F = { A → BC CD → E B → D E → A} F = { A → BC CD → E B → D E → A} Give a lossless, dependency-preserving decomposition into 3NF of schema R
Please apply the Lossless Join Testing algorithm to see if the decomposition D is a lossless...

Please apply the Lossless Join Testing algorithm to see if the decomposition D is a lossless join decomposition. Please provide testing details step by step when you apply the set of functional dependency for testing. Given 1. The universal relation schema Q(CTHRSG), where C = course, T = teacher, H = hour, R = room, S= student, and G = grade. 2. The minimal set of functional dependencies F are assumed: C -> T each course has one...

consider the schema R-(A,B.C,D,E) and the following set F of functional dependencies holds on R ABC...

consider the schema R-(A,B.C,D,E) and the following set F of functional dependencies holds on R ABC CD-E B- D E-A Problem 2. Suppose that we decompose the relation schema R into R, -(A, B, C) and R, (C, D,E). Show that this decomposition is not a lossless-join decomposition.
5c. Consider the relation R(ABCDE) with the set of functional dependencies F={BE→D, DE→A, AD→C, B→E}. Using...

5c. Consider the relation R(ABCDE) with the set of functional dependencies F={BE→D, DE→A, AD→C, B→E}. Using decomposition, find a lossless, dependency preserving, BCNF set of relations for R, if such exists. Be sure to identify the projections of the functional dependencies onto the resulting relations at each stage of the decomposition.
Consider a relational schema R(A, B, C, D) with a set of functional dependencies F =...

Consider a relational schema R(A, B, C, D) with a set of functional dependencies F = { D --> AB, C --> B, CD --> A, AD --> B, B --> A } a. Compute { B, C }+ b. Show that { C, D } is a candidate key of R. c. Is { R1(A, B, C), R2(C, D ) } a lossless-join decomposition? Why? d. Compute a minimal cover Fmin of F.

Let R(A,B,C,D,E) be a relation with FDs F = {AB-CD, A-E, C-D, D-E} The decomposition of...

Let R(A,B,C,D,E) be a relation with FDs F = {AB-CD, A-E, C-D, D-E} The decomposition of Rinto R1(A, B, C), R2(B, C, D) and R3(C, D, E) is 2 Points) Select one: Lossless and Dependency Preserving. Lossy and Not Dependency Preserving. Lossless and Not Dependency Preserving. Lossy and Dependency Preserving.
Let R(A,B,C,D,E) be a relation with FDs F = {AB-CD, A-E, C-D, D-E} The decomposition of...

Let R(A,B,C,D,E) be a relation with FDs F = {AB-CD, A-E, C-D, D-E} The decomposition of Rinto R1(A, B, C), R2(B, C, D) and R3(C, D, E) is 2 Points) Select one: Lossless and Dependency Preserving. Lossy and Not Dependency Preserving. Lossless and Not Dependency Preserving. Lossy and Dependency Preserving.
Let R(A,B,C,D,E) be a relation with FDs F = {AB-CD, A-E, C-D, DE} The decomposition of...

Let R(A,B,C,D,E) be a relation with FDs F = {AB-CD, A-E, C-D, DE} The decomposition of R into R1(A, B, C), R2(B, C, D) and R3(C, D, E) is (2 Points) Select one: Lossy and Dependency Preserving. Lossless and Not Dependency Preserving. Lossy and Not Dependency Preserving. Lossless and Dependency Preserving.

Consider the schema R=(A, B, C, D, E) and let the following set F of functional...

Consider the schema R=(A, B, C, D, E) and let the following set F of functional dependencies hold for R: F= {A → BC, CD → E, B D } Problem 3 Suppose that the schema R=(A, B, C, D, E) is decomposed into R/ - (A, B, C) and R=(A, D, E). Show if this decomposition is a lossless decomposition with respect to the given set of functional dependencies F.